Synthetic board for building purposes



FIG. 1 is top plan view of the synthetic boards with a center section broken away to disclose indefinite length;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof with a center section broken away to disclose indefinite length;

FIG. 4 is a sectional view thereof along lines 4—4 of FIG. 3;

FIG. 5 is a bottom view thereof with a center section broken away to disclose indefinite length; and,

FIG. 6 is a perspective view thereof with a center section broken away to disclose indefinite length.

The portions shown in broken lines are included to show that the design is repeated throughout its length.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a synthetic board for building purposes, as shown and described. 